Question
I had five camellia bushes now i have 2 that aren't dead yet. All the leaves are falling off . They have a green fungus or something on bush. The largest on I lost was six feet tall. Please help ! maybe i can save the ones i still have.

Answer
It sounds like you are describing a parasitic algae on the leaves.  This should not cause the plant to be losing leaves.  They could, however, be planted in a shaded, wet environment and what is happening is a root rot.  Check the watering and soil moisture.  If it is really damp, dig around the roots and see if any of them are brown in color and soft and mushy.  Please respond back with your results and I can recommend a treatment option.  Thanks.